How much pluck will William Close bring to Carlsbad’s Museum of Making Music Thursday to celebrate the 2018 edition of Make Music Day?

Enough pluck to perform on his one-of-a-kind Earth Harp, which holds the Guinness World Record for being the longest stringed instrument in existence.

Standing between 50 feet and 985 feet high — depending on where it is being played — the Earth Harp sounds like a giant cello and is so large it can require an ensemble to play.

Yet, while this behemoth would stand out in any setting, the Earth Harp won’t be the only attraction at today’s all-ages event.

Attendees who want a hands-on experience can help craft their own instruments to strum. There will also be an interactive drum circle, open mic sessions (bring your own instruments) and — if all the slots haven’t been reserved — access to the Interaction Innovation Studio, where visitors can jam on drums, guitars, keyboards and more.

Make Music Day: 10 a.m. to 5 p.m. Thursday, June 21. Museum of Making Music, 5790 Armada Drive, Carlsbad. Pay what you like. (760) 438-5996 or museumofmakingmusic.org